Oh dear. Oh dear. @ocrdu. After such a wonderful exposition on wall it is with heavy heart that I must point out that this is, in fact, not wall but house.

Or, to be more precise, you have gone beyond the concept of wallness and into the realms of house. Admittedly you have not fully reached proof of house, but I do feel that since you are open to the endless possibilities for new knowledge, you might want to ponder more on your current understanding of the idea of "wall".